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ospf6_interface.c
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/*
* Copyright (C) 2003 Yasuhiro Ohara
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include "memory.h"
#include "if.h"
#include "log.h"
#include "command.h"
#include "thread.h"
#include "prefix.h"
#include "plist.h"
#include "zclient.h"
#include "ospf6_lsa.h"
#include "ospf6_lsdb.h"
#include "ospf6_top.h"
#include "ospf6_network.h"
#include "ospf6_message.h"
#include "ospf6_route.h"
#include "ospf6_area.h"
#include "ospf6_abr.h"
#include "ospf6_interface.h"
#include "ospf6_neighbor.h"
#include "ospf6_intra.h"
#include "ospf6_spf.h"
#include "ospf6d.h"
#include "ospf6_bfd.h"
#include "ospf6_zebra.h"
#include "ospf6_gr.h"
#include "lib/json.h"
#include "ospf6_proto.h"
#include "lib/keychain.h"
#include "ospf6_auth_trailer.h"
DEFINE_MTYPE_STATIC(OSPF6D, OSPF6_IF, "OSPF6 interface");
DEFINE_MTYPE(OSPF6D, OSPF6_AUTH_KEYCHAIN, "OSPF6 auth keychain");
DEFINE_MTYPE(OSPF6D, OSPF6_AUTH_MANUAL_KEY, "OSPF6 auth key");
DEFINE_MTYPE_STATIC(OSPF6D, CFG_PLIST_NAME, "configured prefix list names");
DEFINE_QOBJ_TYPE(ospf6_interface);
DEFINE_HOOK(ospf6_interface_change,
(struct ospf6_interface * oi, int state, int old_state),
(oi, state, old_state));
unsigned char conf_debug_ospf6_interface = 0;
const char *const ospf6_interface_state_str[] = {
"None", "Down", "Loopback", "Waiting", "PointToPoint",
"DROther", "BDR", "DR", NULL};
int ospf6_interface_neighbor_count(struct ospf6_interface *oi)
{
int count = 0;
struct ospf6_neighbor *nbr = NULL;
struct listnode *node;
for (ALL_LIST_ELEMENTS_RO(oi->neighbor_list, node, nbr)) {
/* Down state is not shown. */
if (nbr->state == OSPF6_NEIGHBOR_DOWN)
continue;
count++;
}
return count;
}
struct ospf6_interface *ospf6_interface_lookup_by_ifindex(ifindex_t ifindex,
vrf_id_t vrf_id)
{
struct ospf6_interface *oi;
struct interface *ifp;
ifp = if_lookup_by_index(ifindex, vrf_id);
if (ifp == NULL)
return (struct ospf6_interface *)NULL;
oi = (struct ospf6_interface *)ifp->info;
return oi;
}
/* schedule routing table recalculation */
static void ospf6_interface_lsdb_hook(struct ospf6_lsa *lsa,
unsigned int reason)
{
struct ospf6_interface *oi;
if (lsa == NULL)
return;
oi = lsa->lsdb->data;
switch (ntohs(lsa->header->type)) {
case OSPF6_LSTYPE_LINK:
if (oi->state == OSPF6_INTERFACE_DR)
OSPF6_INTRA_PREFIX_LSA_SCHEDULE_TRANSIT(oi);
if (oi->area)
ospf6_spf_schedule(oi->area->ospf6, reason);
break;
default:
break;
}
}
static void ospf6_interface_lsdb_hook_add(struct ospf6_lsa *lsa)
{
ospf6_interface_lsdb_hook(lsa, ospf6_lsadd_to_spf_reason(lsa));
}
static void ospf6_interface_lsdb_hook_remove(struct ospf6_lsa *lsa)
{
ospf6_interface_lsdb_hook(lsa, ospf6_lsremove_to_spf_reason(lsa));
}
static uint8_t ospf6_default_iftype(struct interface *ifp)
{
if (if_is_pointopoint(ifp))
return OSPF_IFTYPE_POINTOPOINT;
else if (if_is_loopback(ifp))
return OSPF_IFTYPE_LOOPBACK;
else
return OSPF_IFTYPE_BROADCAST;
}
static uint32_t ospf6_interface_get_cost(struct ospf6_interface *oi)
{
/* If all else fails, use default OSPF cost */
uint32_t cost;
uint32_t bw, refbw;
struct ospf6 *ospf6;
/* interface speed and bw can be 0 in some platforms,
* use ospf default bw. If bw is configured then it would
* be used.
*/
if (!oi->interface->bandwidth && oi->interface->speed) {
bw = oi->interface->speed;
} else {
bw = oi->interface->bandwidth ? oi->interface->bandwidth
: OSPF6_INTERFACE_BANDWIDTH;
}
ospf6 = oi->interface->vrf->info;
refbw = ospf6 ? ospf6->ref_bandwidth : OSPF6_REFERENCE_BANDWIDTH;
/* A specified ip ospf cost overrides a calculated one. */
if (CHECK_FLAG(oi->flag, OSPF6_INTERFACE_NOAUTOCOST))
cost = oi->cost;
else {
cost = (uint32_t)((double)refbw / (double)bw + (double)0.5);
if (cost < 1)
cost = 1;
}
return cost;
}
static void ospf6_interface_force_recalculate_cost(struct ospf6_interface *oi)
{
/* update cost held in route_connected list in ospf6_interface */
ospf6_interface_connected_route_update(oi->interface);
/* execute LSA hooks */
if (oi->area) {
OSPF6_LINK_LSA_SCHEDULE(oi);
OSPF6_ROUTER_LSA_SCHEDULE(oi->area);
OSPF6_NETWORK_LSA_SCHEDULE(oi);
OSPF6_INTRA_PREFIX_LSA_SCHEDULE_TRANSIT(oi);
OSPF6_INTRA_PREFIX_LSA_SCHEDULE_STUB(oi->area);
}
}
static void ospf6_interface_recalculate_cost(struct ospf6_interface *oi)
{
uint32_t newcost;
newcost = ospf6_interface_get_cost(oi);
if (newcost == oi->cost)
return;
oi->cost = newcost;
ospf6_interface_force_recalculate_cost(oi);
}
/* Create new ospf6 interface structure */
struct ospf6_interface *ospf6_interface_create(struct interface *ifp)
{
struct ospf6_interface *oi;
unsigned int iobuflen;
oi = XCALLOC(MTYPE_OSPF6_IF, sizeof(struct ospf6_interface));
oi->obuf = ospf6_fifo_new();
oi->area = (struct ospf6_area *)NULL;
oi->neighbor_list = list_new();
oi->neighbor_list->cmp = ospf6_neighbor_cmp;
oi->linklocal_addr = (struct in6_addr *)NULL;
oi->instance_id = OSPF6_INTERFACE_INSTANCE_ID;
oi->transdelay = OSPF6_INTERFACE_TRANSDELAY;
oi->priority = OSPF6_INTERFACE_PRIORITY;
oi->hello_interval = OSPF_HELLO_INTERVAL_DEFAULT;
oi->dead_interval = OSPF_ROUTER_DEAD_INTERVAL_DEFAULT;
oi->rxmt_interval = OSPF_RETRANSMIT_INTERVAL_DEFAULT;
oi->type = ospf6_default_iftype(ifp);
oi->state = OSPF6_INTERFACE_DOWN;
oi->flag = 0;
oi->mtu_ignore = 0;
oi->c_ifmtu = 0;
/* Try to adjust I/O buffer size with IfMtu */
oi->ifmtu = ifp->mtu6;
iobuflen = ospf6_iobuf_size(ifp->mtu6);
if (oi->ifmtu > iobuflen) {
if (IS_OSPF6_DEBUG_INTERFACE)
zlog_debug(
"Interface %s: IfMtu is adjusted to I/O buffer size: %d.",
ifp->name, iobuflen);
oi->ifmtu = iobuflen;
}
QOBJ_REG(oi, ospf6_interface);
oi->lsupdate_list = ospf6_lsdb_create(oi);
oi->lsack_list = ospf6_lsdb_create(oi);
oi->lsdb = ospf6_lsdb_create(oi);
oi->lsdb->hook_add = ospf6_interface_lsdb_hook_add;
oi->lsdb->hook_remove = ospf6_interface_lsdb_hook_remove;
oi->lsdb_self = ospf6_lsdb_create(oi);
oi->route_connected =
OSPF6_ROUTE_TABLE_CREATE(INTERFACE, CONNECTED_ROUTES);
oi->route_connected->scope = oi;
/* link both */
oi->interface = ifp;
ifp->info = oi;
/* Compute cost. */
oi->cost = ospf6_interface_get_cost(oi);
oi->at_data.flags = 0;
return oi;
}
void ospf6_interface_delete(struct ospf6_interface *oi)
{
struct listnode *node, *nnode;
struct ospf6_neighbor *on;
QOBJ_UNREG(oi);
ospf6_fifo_free(oi->obuf);
for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on))
ospf6_neighbor_delete(on);
list_delete(&oi->neighbor_list);
THREAD_OFF(oi->thread_send_hello);
THREAD_OFF(oi->thread_send_lsupdate);
THREAD_OFF(oi->thread_send_lsack);
THREAD_OFF(oi->thread_sso);
THREAD_OFF(oi->thread_wait_timer);
ospf6_lsdb_remove_all(oi->lsdb);
ospf6_lsdb_remove_all(oi->lsupdate_list);
ospf6_lsdb_remove_all(oi->lsack_list);
ospf6_lsdb_delete(oi->lsdb);
ospf6_lsdb_delete(oi->lsdb_self);
ospf6_lsdb_delete(oi->lsupdate_list);
ospf6_lsdb_delete(oi->lsack_list);
ospf6_route_table_delete(oi->route_connected);
/* cut link */
oi->interface->info = NULL;
/* plist_name */
if (oi->plist_name)
XFREE(MTYPE_CFG_PLIST_NAME, oi->plist_name);
/* disable from area list if possible */
ospf6_area_interface_delete(oi);
/* Free BFD allocated data. */
XFREE(MTYPE_TMP, oi->bfd_config.profile);
XFREE(MTYPE_OSPF6_IF, oi);
}
void ospf6_interface_enable(struct ospf6_interface *oi)
{
UNSET_FLAG(oi->flag, OSPF6_INTERFACE_DISABLE);
ospf6_interface_state_update(oi->interface);
}
void ospf6_interface_disable(struct ospf6_interface *oi)
{
SET_FLAG(oi->flag, OSPF6_INTERFACE_DISABLE);
thread_execute(master, interface_down, oi, 0);
ospf6_lsdb_remove_all(oi->lsdb);
ospf6_lsdb_remove_all(oi->lsdb_self);
ospf6_lsdb_remove_all(oi->lsupdate_list);
ospf6_lsdb_remove_all(oi->lsack_list);
THREAD_OFF(oi->thread_send_hello);
THREAD_OFF(oi->thread_send_lsupdate);
THREAD_OFF(oi->thread_send_lsack);
THREAD_OFF(oi->thread_sso);
THREAD_OFF(oi->thread_network_lsa);
THREAD_OFF(oi->thread_link_lsa);
THREAD_OFF(oi->thread_intra_prefix_lsa);
THREAD_OFF(oi->thread_as_extern_lsa);
THREAD_OFF(oi->thread_wait_timer);
}
static struct in6_addr *
ospf6_interface_get_linklocal_address(struct interface *ifp)
{
struct listnode *n;
struct connected *c;
struct in6_addr *l = (struct in6_addr *)NULL;
/* for each connected address */
for (ALL_LIST_ELEMENTS_RO(ifp->connected, n, c)) {
/* if family not AF_INET6, ignore */
if (c->address->family != AF_INET6)
continue;
/* linklocal scope check */
if (IN6_IS_ADDR_LINKLOCAL(&c->address->u.prefix6))
l = &c->address->u.prefix6;
}
return l;
}
void ospf6_interface_state_update(struct interface *ifp)
{
struct ospf6_interface *oi;
unsigned int iobuflen;
oi = (struct ospf6_interface *)ifp->info;
if (oi == NULL)
return;
if (CHECK_FLAG(oi->flag, OSPF6_INTERFACE_DISABLE))
return;
/* Adjust the mtu values if the kernel told us something new */
if (ifp->mtu6 != oi->ifmtu) {
/* If nothing configured, accept it and check for buffer size */
if (!oi->c_ifmtu) {
oi->ifmtu = ifp->mtu6;
iobuflen = ospf6_iobuf_size(ifp->mtu6);
if (oi->ifmtu > iobuflen) {
if (IS_OSPF6_DEBUG_INTERFACE)
zlog_debug(
"Interface %s: IfMtu is adjusted to I/O buffer size: %d.",
ifp->name, iobuflen);
oi->ifmtu = iobuflen;
}
} else if (oi->c_ifmtu > ifp->mtu6) {
oi->ifmtu = ifp->mtu6;
zlog_warn(
"Configured mtu %u on %s overridden by kernel %u",
oi->c_ifmtu, ifp->name, ifp->mtu6);
} else
oi->ifmtu = oi->c_ifmtu;
}
if (if_is_operative(ifp)
&& (ospf6_interface_get_linklocal_address(oi->interface)
|| if_is_loopback(oi->interface)))
thread_execute(master, interface_up, oi, 0);
else
thread_execute(master, interface_down, oi, 0);
return;
}
void ospf6_interface_connected_route_update(struct interface *ifp)
{
struct ospf6_interface *oi;
struct ospf6_route *route;
struct connected *c;
struct listnode *node, *nnode;
struct in6_addr nh_addr;
oi = (struct ospf6_interface *)ifp->info;
if (oi == NULL)
return;
/* reset linklocal pointer */
oi->linklocal_addr = ospf6_interface_get_linklocal_address(ifp);
/* if area is null, do not make connected-route list */
if (oi->area == NULL)
return;
if (CHECK_FLAG(oi->flag, OSPF6_INTERFACE_DISABLE))
return;
/* update "route to advertise" interface route table */
ospf6_route_remove_all(oi->route_connected);
for (ALL_LIST_ELEMENTS(oi->interface->connected, node, nnode, c)) {
if (c->address->family != AF_INET6)
continue;
CONTINUE_IF_ADDRESS_LINKLOCAL(IS_OSPF6_DEBUG_INTERFACE,
c->address);
CONTINUE_IF_ADDRESS_UNSPECIFIED(IS_OSPF6_DEBUG_INTERFACE,
c->address);
CONTINUE_IF_ADDRESS_LOOPBACK(IS_OSPF6_DEBUG_INTERFACE,
c->address);
CONTINUE_IF_ADDRESS_V4COMPAT(IS_OSPF6_DEBUG_INTERFACE,
c->address);
CONTINUE_IF_ADDRESS_V4MAPPED(IS_OSPF6_DEBUG_INTERFACE,
c->address);
/* apply filter */
if (oi->plist_name) {
struct prefix_list *plist;
enum prefix_list_type ret;
plist = prefix_list_lookup(AFI_IP6, oi->plist_name);
ret = prefix_list_apply(plist, (void *)c->address);
if (ret == PREFIX_DENY) {
if (IS_OSPF6_DEBUG_INTERFACE)
zlog_debug(
"%pFX on %s filtered by prefix-list %s ",
c->address, oi->interface->name,
oi->plist_name);
continue;
}
}
route = ospf6_route_create(oi->area->ospf6);
memcpy(&route->prefix, c->address, sizeof(struct prefix));
apply_mask(&route->prefix);
route->type = OSPF6_DEST_TYPE_NETWORK;
route->path.area_id = oi->area->area_id;
route->path.type = OSPF6_PATH_TYPE_INTRA;
route->path.cost = oi->cost;
inet_pton(AF_INET6, "::1", &nh_addr);
ospf6_route_add_nexthop(route, oi->interface->ifindex,
&nh_addr);
ospf6_route_add(route, oi->route_connected);
}
/* create new Link-LSA */
OSPF6_LINK_LSA_SCHEDULE(oi);
OSPF6_INTRA_PREFIX_LSA_SCHEDULE_TRANSIT(oi);
OSPF6_INTRA_PREFIX_LSA_SCHEDULE_STUB(oi->area);
}
static int ospf6_interface_state_change(uint8_t next_state,
struct ospf6_interface *oi)
{
uint8_t prev_state;
struct ospf6 *ospf6;
prev_state = oi->state;
oi->state = next_state;
if (prev_state == next_state)
return -1;
if (!oi->area)
return -1;
/* log */
if (IS_OSPF6_DEBUG_INTERFACE) {
zlog_debug("Interface state change %s: %s -> %s",
oi->interface->name,
ospf6_interface_state_str[prev_state],
ospf6_interface_state_str[next_state]);
}
oi->state_change++;
ospf6 = oi->area->ospf6;
if ((prev_state == OSPF6_INTERFACE_DR
|| prev_state == OSPF6_INTERFACE_BDR)
&& (next_state != OSPF6_INTERFACE_DR
&& next_state != OSPF6_INTERFACE_BDR))
ospf6_sso(oi->interface->ifindex, &alldrouters6,
IPV6_LEAVE_GROUP, ospf6->fd);
if ((prev_state != OSPF6_INTERFACE_DR
&& prev_state != OSPF6_INTERFACE_BDR)
&& (next_state == OSPF6_INTERFACE_DR
|| next_state == OSPF6_INTERFACE_BDR))
ospf6_sso(oi->interface->ifindex, &alldrouters6,
IPV6_JOIN_GROUP, ospf6->fd);
OSPF6_ROUTER_LSA_SCHEDULE(oi->area);
OSPF6_LINK_LSA_SCHEDULE(oi);
if (next_state == OSPF6_INTERFACE_DOWN) {
OSPF6_NETWORK_LSA_EXECUTE(oi);
OSPF6_INTRA_PREFIX_LSA_EXECUTE_TRANSIT(oi);
OSPF6_INTRA_PREFIX_LSA_SCHEDULE_STUB(oi->area);
OSPF6_INTRA_PREFIX_LSA_EXECUTE_TRANSIT(oi);
} else if (prev_state == OSPF6_INTERFACE_DR
|| next_state == OSPF6_INTERFACE_DR) {
OSPF6_NETWORK_LSA_SCHEDULE(oi);
OSPF6_INTRA_PREFIX_LSA_SCHEDULE_TRANSIT(oi);
OSPF6_INTRA_PREFIX_LSA_SCHEDULE_STUB(oi->area);
}
hook_call(ospf6_interface_change, oi, next_state, prev_state);
return 0;
}
/* DR Election, RFC2328 section 9.4 */
#define IS_ELIGIBLE(n) \
((n)->state >= OSPF6_NEIGHBOR_TWOWAY && (n)->priority != 0)
static struct ospf6_neighbor *better_bdrouter(struct ospf6_neighbor *a,
struct ospf6_neighbor *b)
{
if ((a == NULL || !IS_ELIGIBLE(a) || a->drouter == a->router_id)
&& (b == NULL || !IS_ELIGIBLE(b) || b->drouter == b->router_id))
return NULL;
else if (a == NULL || !IS_ELIGIBLE(a) || a->drouter == a->router_id)
return b;
else if (b == NULL || !IS_ELIGIBLE(b) || b->drouter == b->router_id)
return a;
if (a->bdrouter == a->router_id && b->bdrouter != b->router_id)
return a;
if (a->bdrouter != a->router_id && b->bdrouter == b->router_id)
return b;
if (a->priority > b->priority)
return a;
if (a->priority < b->priority)
return b;
if (ntohl(a->router_id) > ntohl(b->router_id))
return a;
if (ntohl(a->router_id) < ntohl(b->router_id))
return b;
zlog_warn("Router-ID duplicate ?");
return a;
}
static struct ospf6_neighbor *better_drouter(struct ospf6_neighbor *a,
struct ospf6_neighbor *b)
{
if ((a == NULL || !IS_ELIGIBLE(a) || a->drouter != a->router_id)
&& (b == NULL || !IS_ELIGIBLE(b) || b->drouter != b->router_id))
return NULL;
else if (a == NULL || !IS_ELIGIBLE(a) || a->drouter != a->router_id)
return b;
else if (b == NULL || !IS_ELIGIBLE(b) || b->drouter != b->router_id)
return a;
if (a->drouter == a->router_id && b->drouter != b->router_id)
return a;
if (a->drouter != a->router_id && b->drouter == b->router_id)
return b;
if (a->priority > b->priority)
return a;
if (a->priority < b->priority)
return b;
if (ntohl(a->router_id) > ntohl(b->router_id))
return a;
if (ntohl(a->router_id) < ntohl(b->router_id))
return b;
zlog_warn("Router-ID duplicate ?");
return a;
}
uint8_t dr_election(struct ospf6_interface *oi)
{
struct listnode *node, *nnode;
struct ospf6_neighbor *on, *drouter, *bdrouter, myself;
struct ospf6_neighbor *best_drouter, *best_bdrouter;
uint8_t next_state = 0;
drouter = bdrouter = NULL;
best_drouter = best_bdrouter = NULL;
/* pseudo neighbor myself, including noting current DR/BDR (1) */
memset(&myself, 0, sizeof(myself));
inet_ntop(AF_INET, &oi->area->ospf6->router_id, myself.name,
sizeof(myself.name));
myself.state = OSPF6_NEIGHBOR_TWOWAY;
myself.drouter = oi->drouter;
myself.bdrouter = oi->bdrouter;
myself.priority = oi->priority;
myself.router_id = oi->area->ospf6->router_id;
/* Electing BDR (2) */
for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on))
bdrouter = better_bdrouter(bdrouter, on);
best_bdrouter = bdrouter;
bdrouter = better_bdrouter(best_bdrouter, &myself);
/* Electing DR (3) */
for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on))
drouter = better_drouter(drouter, on);
best_drouter = drouter;
drouter = better_drouter(best_drouter, &myself);
if (drouter == NULL)
drouter = bdrouter;
/* the router itself is newly/no longer DR/BDR (4) */
if ((drouter == &myself && myself.drouter != myself.router_id)
|| (drouter != &myself && myself.drouter == myself.router_id)
|| (bdrouter == &myself && myself.bdrouter != myself.router_id)
|| (bdrouter != &myself && myself.bdrouter == myself.router_id)) {
myself.drouter = (drouter ? drouter->router_id : htonl(0));
myself.bdrouter = (bdrouter ? bdrouter->router_id : htonl(0));
/* compatible to Electing BDR (2) */
bdrouter = better_bdrouter(best_bdrouter, &myself);
/* compatible to Electing DR (3) */
drouter = better_drouter(best_drouter, &myself);
if (drouter == NULL)
drouter = bdrouter;
}
/* Set interface state accordingly (5) */
if (drouter && drouter == &myself)
next_state = OSPF6_INTERFACE_DR;
else if (bdrouter && bdrouter == &myself)
next_state = OSPF6_INTERFACE_BDR;
else
next_state = OSPF6_INTERFACE_DROTHER;
/* If NBMA, schedule Start for each neighbor having priority of 0 (6) */
/* XXX */
/* If DR or BDR change, invoke AdjOK? for each neighbor (7) */
/* RFC 2328 section 12.4. Originating LSAs (3) will be handled
accordingly after AdjOK */
if (oi->drouter != (drouter ? drouter->router_id : htonl(0))
|| oi->bdrouter != (bdrouter ? bdrouter->router_id : htonl(0))) {
if (IS_OSPF6_DEBUG_INTERFACE)
zlog_debug("DR Election on %s: DR: %s BDR: %s",
oi->interface->name,
(drouter ? drouter->name : "0.0.0.0"),
(bdrouter ? bdrouter->name : "0.0.0.0"));
for (ALL_LIST_ELEMENTS_RO(oi->neighbor_list, node, on)) {
if (on->state < OSPF6_NEIGHBOR_TWOWAY)
continue;
/* Schedule AdjOK. */
thread_add_event(master, adj_ok, on, 0,
&on->thread_adj_ok);
}
}
oi->drouter = (drouter ? drouter->router_id : htonl(0));
oi->bdrouter = (bdrouter ? bdrouter->router_id : htonl(0));
return next_state;
}
#ifdef __FreeBSD__
#include <ifaddrs.h>
static bool ifmaddr_check(ifindex_t ifindex, struct in6_addr *addr)
{
struct ifmaddrs *ifmap, *ifma;
struct sockaddr_dl *sdl;
struct sockaddr_in6 *sin6;
bool found = false;
if (getifmaddrs(&ifmap) != 0)
return false;
for (ifma = ifmap; ifma; ifma = ifma->ifma_next) {
if (ifma->ifma_name == NULL || ifma->ifma_addr == NULL)
continue;
if (ifma->ifma_name->sa_family != AF_LINK)
continue;
if (ifma->ifma_addr->sa_family != AF_INET6)
continue;
sdl = (struct sockaddr_dl *)ifma->ifma_name;
sin6 = (struct sockaddr_in6 *)ifma->ifma_addr;
if (sdl->sdl_index == ifindex
&& memcmp(&sin6->sin6_addr, addr, IPV6_MAX_BYTELEN) == 0) {
found = true;
break;
}
}
if (ifmap)
freeifmaddrs(ifmap);
return found;
}
#endif /* __FreeBSD__ */
/* Interface State Machine */
void interface_up(struct thread *thread)
{
struct ospf6_interface *oi;
struct ospf6 *ospf6;
oi = (struct ospf6_interface *)THREAD_ARG(thread);
assert(oi && oi->interface);
if (!oi->type_cfg)
oi->type = ospf6_default_iftype(oi->interface);
thread_cancel(&oi->thread_sso);
if (IS_OSPF6_DEBUG_INTERFACE)
zlog_debug("Interface Event %s: [InterfaceUp]",
oi->interface->name);
/* check physical interface is up */
if (!if_is_operative(oi->interface)) {
zlog_warn("Interface %s is down, can't execute [InterfaceUp]",
oi->interface->name);
return;
}
/* check interface has a link-local address */
if (!(ospf6_interface_get_linklocal_address(oi->interface)
|| if_is_loopback(oi->interface))) {
zlog_warn(
"Interface %s has no link local address, can't execute [InterfaceUp]",
oi->interface->name);
return;
}
/* Recompute cost */
ospf6_interface_recalculate_cost(oi);
/* if already enabled, do nothing */
if (oi->state > OSPF6_INTERFACE_DOWN) {
if (IS_OSPF6_DEBUG_INTERFACE)
zlog_debug("Interface %s already enabled",
oi->interface->name);
return;
}
/* If no area assigned, return */
if (oi->area == NULL) {
zlog_warn(
"%s: Not scheduling Hello for %s as there is no area assigned yet",
__func__, oi->interface->name);
return;
}
#ifdef __FreeBSD__
/*
* There's a delay in FreeBSD between issuing a command to leave a
* multicast group and an actual leave. If we execute "no router ospf6"
* and "router ospf6" fast enough, we can end up in a situation when OS
* performs the leave later than it performs the join and the interface
* remains without a multicast group. We have to do the join only after
* the interface actually left the group.
*/
if (ifmaddr_check(oi->interface->ifindex, &allspfrouters6)) {
zlog_info(
"Interface %s is still in all routers group, rescheduling for SSO",
oi->interface->name);
thread_add_timer(master, interface_up, oi,
OSPF6_INTERFACE_SSO_RETRY_INT,
&oi->thread_sso);
return;
}
#endif /* __FreeBSD__ */
ospf6 = oi->area->ospf6;
/* Join AllSPFRouters */
if (ospf6_sso(oi->interface->ifindex, &allspfrouters6, IPV6_JOIN_GROUP,
ospf6->fd)
< 0) {
if (oi->sso_try_cnt++ < OSPF6_INTERFACE_SSO_RETRY_MAX) {
zlog_info(
"Scheduling %s for sso retry, trial count: %d",
oi->interface->name, oi->sso_try_cnt);
thread_add_timer(master, interface_up, oi,
OSPF6_INTERFACE_SSO_RETRY_INT,
&oi->thread_sso);
}
return;
}
oi->sso_try_cnt = 0; /* Reset on success */
/* Update interface route */
ospf6_interface_connected_route_update(oi->interface);
/* Schedule Hello */
if (!CHECK_FLAG(oi->flag, OSPF6_INTERFACE_PASSIVE)
&& !if_is_loopback(oi->interface)) {
thread_add_timer(master, ospf6_hello_send, oi, 0,
&oi->thread_send_hello);
}
/* decide next interface state */
if (oi->type == OSPF_IFTYPE_LOOPBACK) {
ospf6_interface_state_change(OSPF6_INTERFACE_LOOPBACK, oi);
} else if (oi->type == OSPF_IFTYPE_POINTOPOINT) {
ospf6_interface_state_change(OSPF6_INTERFACE_POINTTOPOINT, oi);
} else if (oi->priority == 0)
ospf6_interface_state_change(OSPF6_INTERFACE_DROTHER, oi);
else {
ospf6_interface_state_change(OSPF6_INTERFACE_WAITING, oi);
thread_add_timer(master, wait_timer, oi, oi->dead_interval,
&oi->thread_wait_timer);
}
}
void wait_timer(struct thread *thread)
{
struct ospf6_interface *oi;
oi = (struct ospf6_interface *)THREAD_ARG(thread);
assert(oi && oi->interface);
if (IS_OSPF6_DEBUG_INTERFACE)
zlog_debug("Interface Event %s: [WaitTimer]",
oi->interface->name);
if (oi->state == OSPF6_INTERFACE_WAITING)
ospf6_interface_state_change(dr_election(oi), oi);
}
void backup_seen(struct thread *thread)
{
struct ospf6_interface *oi;
oi = (struct ospf6_interface *)THREAD_ARG(thread);
assert(oi && oi->interface);
if (IS_OSPF6_DEBUG_INTERFACE)
zlog_debug("Interface Event %s: [BackupSeen]",
oi->interface->name);
if (oi->state == OSPF6_INTERFACE_WAITING)
ospf6_interface_state_change(dr_election(oi), oi);
}
void neighbor_change(struct thread *thread)
{
struct ospf6_interface *oi;
oi = (struct ospf6_interface *)THREAD_ARG(thread);
assert(oi && oi->interface);
if (IS_OSPF6_DEBUG_INTERFACE)
zlog_debug("Interface Event %s: [NeighborChange]",
oi->interface->name);
if (oi->state == OSPF6_INTERFACE_DROTHER
|| oi->state == OSPF6_INTERFACE_BDR
|| oi->state == OSPF6_INTERFACE_DR)
ospf6_interface_state_change(dr_election(oi), oi);
}
void interface_down(struct thread *thread)
{
struct ospf6_interface *oi;
struct listnode *node, *nnode;
struct ospf6_neighbor *on;
struct ospf6 *ospf6;
oi = (struct ospf6_interface *)THREAD_ARG(thread);
assert(oi && oi->interface);
if (IS_OSPF6_DEBUG_INTERFACE)
zlog_debug("Interface Event %s: [InterfaceDown]",
oi->interface->name);
/* Stop Hellos */
THREAD_OFF(oi->thread_send_hello);
/* Stop trying to set socket options. */
THREAD_OFF(oi->thread_sso);
/* Cease the HELPER role for all the neighbours
* of this interface.
*/
if (ospf6_interface_neighbor_count(oi)) {
struct listnode *ln;
struct ospf6_neighbor *nbr = NULL;
for (ALL_LIST_ELEMENTS_RO(oi->neighbor_list, ln, nbr))
ospf6_gr_helper_exit(nbr, OSPF6_GR_HELPER_TOPO_CHG);
}
for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on))
ospf6_neighbor_delete(on);
list_delete_all_node(oi->neighbor_list);
/* When interface state is reset, also reset information about
* DR election, as it is no longer valid. */
oi->drouter = oi->prev_drouter = htonl(0);
oi->bdrouter = oi->prev_bdrouter = htonl(0);
if (oi->area == NULL)
return;
ospf6 = oi->area->ospf6;
/* Leave AllSPFRouters */
if (oi->state > OSPF6_INTERFACE_DOWN)
ospf6_sso(oi->interface->ifindex, &allspfrouters6,
IPV6_LEAVE_GROUP, ospf6->fd);
/* deal with write fifo */
ospf6_fifo_flush(oi->obuf);
if (oi->on_write_q) {
listnode_delete(ospf6->oi_write_q, oi);
if (list_isempty(ospf6->oi_write_q))
thread_cancel(&ospf6->t_write);
oi->on_write_q = 0;
}
ospf6_interface_state_change(OSPF6_INTERFACE_DOWN, oi);
}
static const char *ospf6_iftype_str(uint8_t iftype)
{
switch (iftype) {
case OSPF_IFTYPE_LOOPBACK:
return "LOOPBACK";
case OSPF_IFTYPE_BROADCAST:
return "BROADCAST";
case OSPF_IFTYPE_POINTOPOINT:
return "POINTOPOINT";
}
return "UNKNOWN";
}
/* show specified interface structure */
static int ospf6_interface_show(struct vty *vty, struct interface *ifp,
json_object *json_obj, bool use_json)
{
struct ospf6_interface *oi;
struct connected *c;
struct prefix *p;
struct listnode *i;
char strbuf[PREFIX2STR_BUFFER], drouter[32], bdrouter[32];
uint8_t default_iftype;
struct timeval res, now;
char duration[32];
struct ospf6_lsa *lsa, *lsanext;
json_object *json_arr;
json_object *json_addr;
struct json_object *json_auth = NULL;
default_iftype = ospf6_default_iftype(ifp);
if (use_json) {
json_object_string_add(json_obj, "status",
(if_is_operative(ifp) ? "up" : "down"));
json_object_string_add(json_obj, "type",
ospf6_iftype_str(default_iftype));
json_object_int_add(json_obj, "interfaceId", ifp->ifindex);
if (ifp->info == NULL)
return 0;
oi = (struct ospf6_interface *)ifp->info;
if (if_is_operative(ifp) && oi->type != default_iftype)